Cory9584 Posted December 28, 2007 Report Share Posted December 28, 2007 How much do i need to raise the ports to run a 4mm stroker crank? The guy doing the work thinks its 2mm but i just want to be sure. Also the domes i ordered are for pistons that stick 2mm out of the cylinder, is that right? Also the machinist isnt sure if i should be using stock or stroker pistons since im adjusting the ports and not using a shim. I just got bombarded with questions from both the dome guy and the builder so im all confused Quote Link to comment Share on other sites More sharing options...
Washburn Posted December 28, 2007 Report Share Posted December 28, 2007 Well Im not too sure about how much you should raise or open the port,s. But if its a 4mil longrod you need Wiesco 795 series pistons and you need your domes specialy cut both 2mm to compensate for the longer rods at TDC. Quote Link to comment Share on other sites More sharing options...
KEVSWS6 Posted December 29, 2007 Report Share Posted December 29, 2007 How much do i need to raise the ports to run a 4mm stroker crank? The guy doing the work thinks its 2mm but i just want to be sure. Also the domes i ordered are for pistons that stick 2mm out of the cylinder, is that right? Also the machinist isnt sure if i should be using stock or stroker pistons since im adjusting the ports and not using a shim. I just got bombarded with questions from both the dome guy and the builder so im all confused You will drop all the transfers and exhaust floors 2mm. You will need domes cut for a -2mm deck height. A recess of 92 to 97 thousandths is standard for a 4 mil. Raising the roofs is another story. You have to be careful, remember you just added 2mm to all the roofs. Good Luck Kevin Quote Link to comment Share on other sites More sharing options...
Cory9584 Posted December 29, 2007 Author Report Share Posted December 29, 2007 All he's doing is removing 2mm from the bottoms and a fresh bore. For now im not getting any porting done. Hes too busy to do anything elses so ill probably take it apart again next winter when i have more money to throw at it. For now im gonna just get it running and slowly start buying supporting mods. Bigger pipes, carbs, tires, and possibly a better swing arm. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted December 29, 2007 Report Share Posted December 29, 2007 All he's doing is removing 2mm from the bottoms and a fresh bore. For now im not getting any porting done. Hes too busy to do anything elses so ill probably take it apart again next winter when i have more money to throw at it. For now im gonna just get it running and slowly start buying supporting mods. Bigger pipes, carbs, tires, and possibly a better swing arm. You should just send your juggs to some body that knows what they are doing. Quote Link to comment Share on other sites More sharing options...
Cory9584 Posted December 29, 2007 Author Report Share Posted December 29, 2007 You should just send your juggs to some body that knows what they are doing. Thats what im gonna do when i port it next winter. For now he already machined the bores and is lowering the ports but thats it. Im just running out of money for the time being since i just bought the bike and rebuilt the whole engine. Im new to banshees and didnt know of any other places till i started coming here. Im also kinda pressed for time now since its stored at a buddys house till the engines together. Otherwise my family would likely be pissed at me for buying a paperweight Quote Link to comment Share on other sites More sharing options...
Cory9584 Posted December 29, 2007 Author Report Share Posted December 29, 2007 All he's doing is removing 2mm from the bottoms and a fresh bore. For now im not getting any porting done. Hes too busy to do anything elses so ill probably take it apart again next winter when i have more money to throw at it. For now im gonna just get it running and slowly start buying supporting mods. Bigger pipes, carbs, tires, and possibly a better swing arm. I meant hes removing 2mm from the top, my mistake. im kinda tired Quote Link to comment Share on other sites More sharing options...
flotek Posted December 29, 2007 Report Share Posted December 29, 2007 well dropping the ports down to bdc is one thing but you must compensate for the stroke to hit the correct duartions .only way to do this right is to measure degree and map it out ,also be sure to check the squish clearnace when its all said and done ,that clearance is a critical part of the equation,you shoudl run 795 series wiseco pistons . Quote Link to comment Share on other sites More sharing options...
KEVSWS6 Posted December 29, 2007 Report Share Posted December 29, 2007 I meant hes removing 2mm from the top, my mistake. im kinda tired Just 2mm out of the top of the exhaust? That's what I'm guessing. Make sure you understand what he is doing. Quote Link to comment Share on other sites More sharing options...
Cory9584 Posted December 29, 2007 Author Report Share Posted December 29, 2007 I just did some searching and i think i know how its supposed to be now, I think bdc is going to now be too low. So i think what i shouldve done was to move the ports down to be even on bdc. Good thing he only ended up raising the port 1 1/4mm so i can later get it ported correctly for the 4mill. I dont think that 1 1/4 will make much difference once its ported right. Quote Link to comment Share on other sites More sharing options...
KEVSWS6 Posted December 29, 2007 Report Share Posted December 29, 2007 I just did some searching and i think i know how its supposed to be now, I think bdc is going to now be too low. So i think what i shouldve done was to move the ports down to be even on bdc. Good thing he only ended up raising the port 1 1/4mm so i can later get it ported correctly for the 4mill. I dont think that 1 1/4 will make much difference once its ported right. No that wont hurt it at all. An aggressive port job will be higher. Quote Link to comment Share on other sites More sharing options...
Cory9584 Posted December 29, 2007 Author Report Share Posted December 29, 2007 No that wont hurt it at all. An aggressive port job will be higher. Thanks for assuring me that, I will definately be getting a pretty aggressive port when i do it. Quote Link to comment Share on other sites More sharing options...
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